What is the molar concentration of acetic acid in a sample of vinegar?

Prediction:

The manufacture of claims on the label that the vinegar contains 5.0% acetic acid, which translates into a 0.87 mol/L concentration of acetic acid. The concentration of acetic acid in the vinegar sample should be the same.

Purpose:

If we add acid solution to basic solution to produce water and salt this activity is called titration. It involves carefully adding one solution to another until chemically equivalent amounts react. Vinegar is a solution of a weak acid in water. This acid will react with the base sodium hydroxide in a 1:1 molar ratio. If a solution of NaOH of known concentration will used titrate vinegar, it is possible to determine the amount of acetic acid. The main three things from this experiment are: to determine the concentration of vinegar, to verify the description on the product labels, practice the chemical testing technique of titration.

Crystallized acetic acid

A couple of typical organic reactions of acetic ac...

English: Deprotonation equilibrium of acetic acid.

The balanced chemical equation for the neutralization of acetic acid with NaOH is:

Safety notes:

Wear safety glasses and if available. NaOH is corrosive to flesh and can cause blindness. Wash up spills immediately using large amounts of water. Rinse your hands under running water if you come in contact with the NaOH solution. Wash your hands upon completion of the lab.

Materials:

Lab apron eye protection

NaOH(aq) vinegar

Phenolphthalein wash bottle of pure water

Two 100mL or 150mL 250mL beaker

100mL volumetric flask with stopper 50mL buret

10mL volumetric pipet pipet bulb

ring stand buret clamp

stirring rod small funnel

two 250mL Erlenmeyer flasks meniscus finder

Procedure:

1. 10mL of vinegar was obtained in a clean, dry 100mL beaker.

2. One 10.00mL portion was pipeted into a clean 100mL volumetric flask and dilute to the mark.

More Chemistry essays:

... and three different balloons filled with air, helium and one with water, to show the effects that the atmosphere around us has on different gasses and on water. OBSERVATION and ... number so we can easily take the molar mass of SF6 and divide it by three, take that value and compare it to our graph to ...

... years, but there is a basic difference between perfume and pheromones. Pheromones are produced by the body and usually do not smell at all pleasant, whereas perfumes are either synthesized or extracted from natural products and are employed because of their pleasant smell. Scientific ...

... crystals are still used as infrared detectors. Thallium sulphate used to be widely used as a pesticide and an ant killer. It was odorless and tasteless and worked well, but it was found to be too toxic. Thallium slats which burn with a ...

2 pages37Mar/19972.5

Students & Profs. say about us:

"Good news: you can turn to other's writing help. WriteWork has over 100,000 sample papers"